Run results for: typeof undefined vs undefined equality check

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

typeof

7.3M/s

equality

3.8M/s

View exact numbers

Test name	Executions per second
✓ typeof	7,264,546 Ops/sec
equality	3,758,646 Ops/sec

Script Preparation code:

window.obj = undefined

Tests: